Several satellite images (like the one below) of North Korean prisons were released by South Korea today as evidence of some 150,000 people incarcerated there. But it was the emotion on the face of survivor Kim Young Soon that provided the most powerful image.

Saul Loeb / AFP - Getty Images

Kim Young Soon, vice president of the Committee for the Democratization of North Korea and a survivor of 9 years in a North Korean prison camp, testifies on her experiences before the House Foreign Affairs Subcommittee on Africa, Global Health, and Human Rights during a hearing on human rights in North Korea, on Capitol Hill in Washington on September 20.

South Korean Unification Ministr / EPA

Satellite photos of the North Korean prison camp No. 16 in Hwasong, North Hamkyong Province, which South Korea's Unification Ministry disclosed during an interpretation session at the National Assembly in Seoul, South Korea, on Sept.20. The photos were taken after finding locations via Internet search engine Google. The ministry believes North Korea currently runs six prison camps confining some 150,000 people.